Stone dresser



Sept. 30, 1958 s, JAKOBSEN 2,853,993

STONE DRESSER I 2 Sheets-Sheet 1 Filed Nov. 28, 1956 INVENTOR. RRY S. JA BSEN ATTORNEY Sept. 30, 1958 H. s. JAKOBSEN 2,853,993

STONE DRESSER Filed Nov. 28, 1956 2 Sheets-Sheet 2 United States Patent STONE DRESSER Harry S. Jakobsen, Long Valley, N. J.

Application November 28, 1956, Serial No. 624,858

2 Claims. (Cl. 125-11) This invention relates to dressers and more particularly to a device for testing and adjusting dressers for grinding stones.

An object of the invention is to provide a dresser which can follow a template and cut a grinding stone by means of a diamond cutter to a predetermined shape so that the stone in turn may be used to grind material into the desired contour. With my dresser it is possible to form precision grinding wheels into complex contours with high accuracy.

A further object is to provide a relatively simple dresser and means to accurately check the same so that the dressing and cutting elements are in positive alignment.

Preferably, my dresser has three tracing elements and three cutting elements each of which is in alignment. This is convenient since one diamond cutting element may be used for the rougher work, the second for medium work and the third for the finer and finishing Work. As the stone is prepared and as the dresser is used there is a certain amount of wear upon the diamonds and it is necessary to check the relative position between the tracing elements and the diamonds from time to time.

In my preferred form I provide a dresser body having at its lower end steel dresser points or followers which in use follow the pattern of a template on an ordinary grinding table. In the upper end of the dresser I provide three industrial diamonds which do the actual cutting of the stone. As heretofore stated, it is necessary from time to time to make sure that the tracing elements and the diamonds are in direct alignment since, otherwise, inaccuracies will occur.

Other objects and advantages of my invention will be apparent from the accompanying drawings and the following description, in which- Fig. l is a side elevation of the checking table.

Fig. 2 is a sectional view of a portion of the testing table.

Fig. 3 is a sectional view of another portion of the 7 table.

Fig. 4 is a detailed view showing the diamondcutting elements of the dresser.

Fig. 5 is a similar view to Fig. 4 showing the tracing elements.

I provide a testing table having two sections 11 (Fig. 2) and 12 (Fig. 3). The table 10 is provided with a grinding stone 15 powered by a motor 16 and a belt 17. The radial face of the grinding stone is used, and a member 18 extends over the periphery of the grinding stone as a guard member. At the top of the table is mounted a diamond testing disk 20, which is mounted by means of the screw 21 in the head 22, the position of which is controlled by a thrust bracket 23 mounted on a micrometer screw 24 and controlled by the dial 25. The head 22 may be set in position by means of a set screw 26. It will be appreciated that it is usually desirable to have the contact faces of the disk and the grinding stone 15in the same vertical plane so that the diamond and the tracing elements are aligned; 'The other section 11 of the test table 10 is provided with a bracket 30 on which is mounted an indicator 31 having a contact arm 32 engaging the pivoted test member or arm 33. A coil spring 34 and a plunger 35' tend to push the arm 33 outwardly and a stop screw 36 is provided to limit the outward motion. It will be understood that the arm is pivoted at 37 and that this pivot can be limited by the clamp .nut 38 and the clamp screw 39. Carbide inserts 40 provide contact points for testing the dresser.

The dresser 50 comprises the dresser body 51 having a triangular top 52 in which are mounted industrial diamond holders 53, held in place by set screws 54. The lower part 55 of the dresser 50 is likewise triangular in shape as indicated in Fig. 5 and in which are mounted the tracers 56 held in place by the adjusting screws 57 and the set screws 58. The member 55 is provided with openings 59 so that a wrench may be inserted there through to set the screws 57.

When it is desired to test the dresser it is placed on the portion of the table shown in Fig. 2 and the diamond placed in contact with the element 40 of the arm 33. If the diamond has been worn through use the indicator will register the discrepancy. As heretofore indicated, it is necessary to have the tracing elements and the cutting diamond in a predetermined plane, usually vertical, and if this is not so the indicator will indicate the difference between the respective planes. In order to avoid resetting of the diamond, the dresser is moved to the position of the table shown in Fig. 3 with the tracing element against the grinding wheel 15 whereby by manipulation of the dresser the tracing element may be ground to conform to the diamond. It will be understood that the dresser is moved from one position to the other until the indicator shows that the tracer and the diamond are in exact alignment. This is repeated for each of the three points of the dresser so that there will be conformity between the diamonds and the tracing elements. The dresser can be shifted from one position to another until the accuracy has been re-established. It will be understood, of course, that the dresser will be tested in the position shown in Fig. 2 and that any discrepancy between the position of each of the diamond holders and its corresponding tracing element will then be corrected in the position shown in Fig. 3. It will also be appreciated that as long as the diamond holder and the corresponding tracing element are in correct alignment the tracing element will accurately guide the diamond element in the correct position since the tracing element will follow the template and necessarily guide the diamond element in the same path.

I claim:

1. A device for testing and correcting grinding stone dressers which are equipped with a diamond cutting tool, and a tracing element adapted to follow a template, said device comprising a table having two positions, one of said positions having a bar mounted thereon to engage the diamond cutting element and the tracing element, a gauge actuated by said bar indicating any discrepancy between said diamond cutting element and said tracer, the other of said positions containing a contact face for said diamond tool and a grinding wheel to conform said tracing element to said diamond tool.

2. A combined testing and grinding table for grinding stone dressers which are equipped with a diamond cutter and a tracing member adapted to follow a template to guide the diamond cutter, comprising a table having two positions, one of said positions having a bar mounted thereon to engage the diamond cutting element and the tracing element, a gauge actuated by the said bar indi- Patented Sept. 30, 1958 v 3 '4 c a fipg the relative position between said diamond cut- References Cited in the file of this patent ting element and said tracer, the othel: o said positions UNITED STATES PATENTS contalmng a contact face for said gnndlng tool and a grinding wheel to conform said tracing element to said 2305415 Snead 151 1942 diam and mime mean-s afilstvsaid 5 23521333 fififflia iiiiiiiiiiiiif1&2? i3: 132? v f t m 'z'" m 'f. tact ace 0 my 6 2,725,050 Jakobsen Nov. 29, 1955 

